M. S. Mahmud, A. S. M. Yunus, A. S. M. Yunus, and T. Sulaiman, “Types of Oral Questions Used by Teachers in Mathematical Problem Solving Teaching in Primary School Mathematics Teaching”, Psychosocial rehabilitation, vol. 24, no. 6, pp. 2278–2292, Aug. 2020, doi: 10.61841/kdpznd06.